Find the fuel cost for any trip.
Distance divided by mileage gives the fuel required; multiplying by the price per litre gives the cost.
Fuel needed: Distance ÷ mileage
Cost: Fuel needed × price per litre
The fuel cost calculator estimates how much you will spend on fuel for a given distance. You enter the distance, your vehicle's mileage and the price of the fuel, and it tells you how many units of fuel you will burn and what they will cost. It is fuel-neutral, so it works for petrol, diesel or CNG as long as the mileage and the price use the same unit.
Families use it to budget a holiday drive, fleet owners use it to quote a delivery job, and commuters use it to compare driving with a metro or bus pass. Because fuel prices in India differ between states and are revised often, the calculator lets you plug in the price at the pump today rather than relying on an old figure.
1. Find the total distance you will drive in kilometres, including any detours or local running.
2. Use your vehicle's real mileage in km per litre, or km per kg for CNG.
3. Work out the fuel needed: Fuel = Distance ÷ Mileage.
4. Find the local fuel price per litre, or per kg for CNG.
5. Multiply to get the cost: Cost = Fuel × Price.
6. Add a margin of 5% to 10% for traffic, air conditioning and hills if you are budgeting.
The calculation links two rates. Mileage tells you kilometres per litre, so dividing a distance by it gives litres. Price tells you rupees per litre, so multiplying litres by it gives rupees. Written in one line, Cost = Distance × Price ÷ Mileage. The litres cancel out, leaving rupees. A handy by-product is the cost per kilometre, which is simply Price ÷ Mileage. At ₹100 per litre and 15 km/l, every kilometre costs about ₹6.67.
CNG is sold by the kilogram and CNG vehicles quote mileage in km per kg. The formula is unchanged: enter km per kg as mileage and ₹ per kg as the price, and the result is correct because the kilograms cancel just as litres do. What does not work is mixing units, for example a km/l mileage with a per-kg price. The same care applies to LPG autos. The label on the result will still say litres, so read it as kg.
The mileage you enter is an average, but fuel use varies within a trip. City traffic, idling at signals, air conditioning, roof loads, low tyre pressure and steep ghats all push consumption up, while steady highway cruising at moderate speed often gives the best figure. Cost rises in direct proportion to any drop in mileage: if real mileage is 10% lower than you assumed, the fuel bill is about 11% higher. That is why a small buffer is sensible.
Joseph is planning an 850 km family road trip through Kerala and Tamil Nadu in a hatchback that averages 13.5 km per litre, with fuel at ₹102.50 a litre.
Answer: Fuel cost ₹6,454; Fuel needed 62.96 litres
Using the manufacturer's claimed mileage, which is measured in lab conditions and is usually higher than real driving.
Mixing a km/kg CNG mileage with a per-litre price, or the other way round.
Entering the one-way distance for a round trip.
Using the fuel price from a different state, where taxes and therefore prices can be noticeably different.
Forgetting local running at the destination, which can add a surprising number of kilometres.
Budgeting fuel for holidays, pilgrimages and weekend trips.
Comparing the cost of driving with train, bus or flight fares.
Quoting fuel cost for a delivery, taxi or transport job.
Checking how much a change in fuel price affects a monthly commute.
How do I find my vehicle's actual mileage?
Use the Fuel Efficiency calculator with your own real distance travelled and fuel used, instead of relying on the number the manufacturer claims.